/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *    http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.apache.dolphinscheduler.server.master.dispatch.host.assign;

import org.apache.dolphinscheduler.remote.utils.Constants;
import org.apache.dolphinscheduler.remote.utils.Host;

/**
 * host weight
 */
public class HostWeight {

  private final int CPU_FACTOR = 10;

  private final int MEMORY_FACTOR = 20;

  private final int LOAD_AVERAGE_FACTOR = 70;

  private final HostWorker hostWorker;

  private final double weight;

  private double currentWeight;

  private final int waitingTaskCount;

  public HostWeight(HostWorker hostWorker, double cpu, double memory, double loadAverage, int waitingTaskCount, long startTime) {
    this.hostWorker = hostWorker;
    this.weight = calculateWeight(cpu, memory, loadAverage, startTime);
    this.currentWeight = this.weight;
    this.waitingTaskCount = waitingTaskCount;
  }

  public double getWeight() {
    return weight;
  }

  public double getCurrentWeight() {
    return currentWeight;
  }

  public void setCurrentWeight(double currentWeight) {
    this.currentWeight = currentWeight;
  }

  public HostWorker getHostWorker() {
    return hostWorker;
  }

  public Host getHost() {
    return (Host) hostWorker;
  }

  public int getWaitingTaskCount() {
    return waitingTaskCount;
  }

  @Override
  public String toString() {
    return "HostWeight{"
        + "hostWorker=" + hostWorker
        + ", weight=" + weight
        + ", currentWeight=" + currentWeight
        + ", waitingTaskCount=" + waitingTaskCount
        + '}';
  }

  private double calculateWeight(double cpu, double memory, double loadAverage, long startTime) {
    double calculatedWeight = cpu * CPU_FACTOR + memory * MEMORY_FACTOR + loadAverage * LOAD_AVERAGE_FACTOR;
    long uptime = System.currentTimeMillis() - startTime;
    if (uptime > 0 && uptime < Constants.WARM_UP_TIME) {
      // If the warm-up is not over, add the weight
      return calculatedWeight * Constants.WARM_UP_TIME / uptime;
    }
    return calculatedWeight;
  }

}
